Thank you @fiona
I bit the bullet and shut down the VM during lunch break. No problems starting it up after. Doing a manual backup right now and it's running normally.
So the problem is solved and the thread can be closed.
Backup jobs have failed with the message:
ERROR: Backup of VM 104 failed - VM 104 qmp command 'backup' failed - Node 'drive-scsi1' is busy: block device is in use by block job: mirror
So I did the following:
qm monitor 104
qm> info block-jobs...
I just upgraded my PBS from 3.4 to 4.2 and pbs3to4 still gives me a warning after rebooting:
I assume this is not really a problem, just the script was written before kernel 7.0 was an option?